78652237 has 4 divisors (see below), whose sum is σ = 79536060. Its totient is φ = 77768416.

The previous prime is 78652219. The next prime is 78652247. The reversal of 78652237 is 73225687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73225687 = 103 ⋅710929.

It can be written as a sum of positive squares in 2 ways, for example, as 4932841 + 73719396 = 2221^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 78652237 - 2⁷ = 78652109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78652237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78652247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441778 + ... + 441955.

It is an arithmetic number, because the mean of its divisors is an integer number (19884015).

Almost surely, 2^78652237 is an apocalyptic number.

It is an amenable number.

78652237 is a deficient number, since it is larger than the sum of its proper divisors (883823).

78652237 is an equidigital number, since it uses as much as digits as its factorization.

78652237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883822.

The product of its digits is 141120, while the sum is 40.

The square root of 78652237 is about 8868.6096430049. The cubic root of 78652237 is about 428.4534981922.

The spelling of 78652237 in words is "seventy-eight million, six hundred fifty-two thousand, two hundred thirty-seven".